Schneider Electric (Barber Colman) MK-2690 Proportional Control

The Schneider Electric Barber Colman MK-2690 is a specialized pneumatic valve actuator engineered for precise proportional control in demanding HVAC applications. This compact unit features a 6-sq. in. effective area and is primarily designed to drive 1/2" to 2" globe valves, including the VB-7000 series and discontinued VB-9xxx models. Built with a rugged die-cast aluminum housing and a NEMA 1 enclosure, this actuator ensures linear movement with a 1/2" nominal stroke. Its spring return mechanism provides a reliable fail-safe, returning the valve stem to the "up" position upon loss of air pressure. The MK-2690 is field-configurable for multiple control ranges—3-7 PSI, 5-10 PSI, or 8-13 PSI—depending on the specific spring installed via the required AV-400 or AV-7400 linkage kits. It is a direct drop-in replacement for legacy part numbers 23-102 and MK-2690-0-0-2, facilitating seamless maintenance in existing building automation systems.

• Engineered Compatibility: Seamlessly integrates with VB-7XXX series valves and legacy VB-9XXX models using the appropriate linkage.
• Compact & Rugged: The die-cast aluminum construction provides a durable, NEMA 1 rated housing for indoor mechanical environments.
• Fail-Safe Operation: Mechanically certain spring return action retracts the shaft when pneumatic pressure is removed.
• Field Maintenance: Features a replaceable, beaded neoprene diaphragm for extended service life and simplified rebuilds.
• Standardized Connections: Side-located 1/8" FNPT air connection allows for straightforward integration into standard control loops.

Common Questions

What valves are compatible with the MK-2690?
This actuator is designed for 1/2" to 2" Schneider Electric globe valves. Use the AV-7400 linkage for VB-7000 series valves and the AV-400 linkage for older VB-9000 models.

Can the start point be adjusted on this actuator?
No, the start point for the MK-2690 is non-adjustable. The operating range is determined by the specific spring included in your linkage kit (Yellow: 3-7 PSI, Black: 5-10 PSI, or Blue: 8-13 PSI).

What is the maximum air pressure for this unit?
The maximum survival pressure for the MK-2690 pneumatic actuator is 30 psig. Standard operating signals typically fall within the 3 to 13 PSI range.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.